Method of forming piston-rings



A. 1. H. KUHSIEK, METHOD OF FORMING PISTON RINGS.

APPLICATION FILED DEC-9,1918.

Patented Jan. 20, 1920.

N ENTO d/Jert 64 AZaz'e/K.

ATTORNEY ALBERT J. H. KUI-ISIEK, 0F RICHMOND HILL, NEVV YORK.

METHOD OF FORMING PISTON-RINGS.

Application filed December 9, 1818.

To all whom it may concern:

Be it known that I, ALBERT J. H. KUHSIEK, a citlzen of the United States of America,

residing at Richmond Hill, Queens county,

State of New York, have invented certain new and useful Improvements in Methods of Forming Piston-Rings, of which the following is a full, clear, and eXact description.

This invention relates to a process for forming expansible piston rings, and is particularly adapted to produce an inexpensive expansible steel piston-ring of a special construction made of wrought or rolled steel rather than cast-steel, as hereinafter de scribed. To obtain expansibility the rings must necessarily be relatively hard. The necessary degree of hardness is obtained by my improved process by the action of drawing a relatively soft wrought or rolled steel blank into the form of a shell or cup, after which the wall of the shell is cut off to form rings which are afterward split. During the drawing action, by suitable dies or formers, the relatively soft material will be hardened sufliciently to render the therefrom obtained rings expansible after they are split.

I will now proceed to describe in detail the manner of carrying out my process, reference being had to the accompanying drawing, wherein Figure 1 is a perspective view of a form of piston-ring for the production of which my improved process is especially intended;

Fig. 2 illustrates an edge view of a blank of relatively soft steel used in carrying out my process;

Fig. 3 is a sectional view of the shell or cup drawn from the steel blank;

Fig. l is a similar view illustrating manner of obtaining the rings from the the 'shell and Fig. 5 is a perspective view of a form of tool or cutter to produce the rings.

My improved process is especially intended for the production of piston-rings having chamfered edges. To produce a packing for insertion into the annular grooves of a piston two of such rings are placed together or superimposed with the chamfered edges juxtaposed to produce an annular oil-groove. Such a piston packing is illustrated in Fig. 1 and consists of the rings or members 6 and 7, the oil-groove being indicated by 8 and the chamfered edges by 9. In forming my piston rings the bore Specification of Letters Patent.

Patented Jan. 20, 1920.

Serial No. 265,845.

10 of the rings will be concentric to the periphery 11 thereof.

To produce these eXpansible wrought or rolled steel rings, I first take a blank 12 of the proper thickness and area to produce a shell or blank having the requisite exterior diameter. The shell or cup from which the rings will be turned or cut, is herein indicated by 13 and is produced by drawing the blank 12 by means of suitable dies or formers. During the drawing operation, the relatively steel blanks will be hardened sufficiently to produce the desired expansibility in the rings. After the shells or cups are formed, rings will be cut therefrom by a suitable tool. For instance, the shell can be placed in the chuck of a suitable lathe and the rings cut from the wall lat thereof. To produce the style of rings above referred to, I employ a tool A such as is illustrated in Fig. 5, having an end cutting edge 15, a side cutting edge 16 and an angular edge cutting portion 17.

After the shells have been formed, the edge 18 thereof, which will be more or less rough, will be faced off by the cutting edge 16 of the cutter A, to produce a smooth or true surface, indicated by 19 in F ig. 4. After the rough end of the shell has been faced, the cutter will be adjusted to sever the side wall 1d of the shell to produce rings of the proper thickness. During the facing cut the angular cutting edge 17 of the cutter will be caused to chamfer the edge 11 of the shell 13; hence when the cutter has been adjusted to sever the shell to produce a ring, one edge of said ring will be chamfered. After the shell has been severed, a ring will drop off. A. continuance of the inward feeding of the cutter will finally result in the chamfering the edge of the remainder of the wall of the shell or cup. This operation will be repeated until the entire wall ll of the shell has been cut up into rings. hen forming large rings the remaining bottom 20 of the cup can be drawn into a shell or cup for forming smaller piston-rings according to my method, thus utilizing the entire blank. After the rings have been formed they will be split to form an expansi'ble packing element, as shown in Fig. 1. the splitting of piston rings being a well known step in their production;

My improved process possesses the ad vantage of hardening the relatively soft material and is much cheaper than cutting the rings from steel-tubing, which would have to be especially made. In fact the invention is directed toward the production of pistonrings out of wrought steel as cheaply as casting and the Wrought steel is far superior in wearing quality and action.

Having described my invention, what I claim is 1. The method of forming piston-rings, consisting in first preparing a blank of relatively soft steel, then drawing the blank into the form of a shell or cup, then cutting, the wall of the shell into rings, and then splitting the rings.

2. The method of forming piston-rings, consisting in first preparing a blank of relatively soft steel, then drawing the blank into the form of a shell or cup, then chamfering one edge of the shell, then cutting the shell adjacent its chamfered edge to produce a ring, and then splitting the ring.

3. The method of forming piston-rings, consisting in first preparing a blank of relatively soft steel, then drawing the blank into the form of a shell or cup, then facing the end of the shell or cup, chamfering one edge of the shell, cutting the wall of the shell into rings, and then splitting the rings.

Signed at New York city, N. Y., this 6th day of December, 1918.

ALBERT J. H. KUHSIEK.

Witnesses:

EDWARD A. JARVIS. MAURICE BLOCK. 

